Blood Transfusion

“[A]s the Holy Ghost falls upon one of the literal seed of Abraham, it is calm and serene… while the effect of the Holy Ghost upon a Gentile, is to purge out the old blood, and make him actually of the seed of Abraham. That man that has none of the blood of Abraham (naturally) must have a new creation by the Holy Ghost. In such a case, there may be more of a powerful effect upon the body, and visible to the eye, than upon an Israelite.”

- Prophet Joseph Smith, Jr., History of the Church, v. 3, p. 380

“[Joseph taught] that the Gentile blood was actually cleansed out of their veins, and the blood of Jacob made to circulate in them; and the revolution and change in the system were so great that it caused the beholder to think they were going into fits.”